CN104297736B - Correction method for radar receiving channel array - Google Patents
Correction method for radar receiving channel array Download PDFInfo
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- CN104297736B CN104297736B CN201410489974.0A CN201410489974A CN104297736B CN 104297736 B CN104297736 B CN 104297736B CN 201410489974 A CN201410489974 A CN 201410489974A CN 104297736 B CN104297736 B CN 104297736B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4021—Means for monitoring or calibrating of parts of a radar system of receivers
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention relates to a correction method for a radar receiving channel array. According to the method, the amplitudes and phase data of the receiving channel array at multiple angles are firstly recorded, and then amplitude and phase correction is carried out. The amplitude correction value is obtained through the method of averaging amplitude measurement values of the multiple angles. According to the calculation of the phase correction value, a phase reference channel is selected firstly, the theoretical phase deviation value of the reference channel is subtracted from the phase measurement value of each angle, bad values are removed, the residual data are averaged, then the phase deviation value is obtained, and the phase correction value is further obtained.
Description
Technical field
The present invention relates to a kind of bearing calibration receiving channel array for radar, belong to Signal and Signal Treatment field.
Background technology
Phased Array Radar Antenna system generally comprises multiple reception passage, owing to being difficult to ensure that all passages in production process
The opering characteristic of electric apparatus consistent, it is poor that this will make each passage exist in the parameters such as bandwidth, gain, phase place, lag characteristic and noise coefficient
Different.So when identical signal enters passage, each passage will produce different output signals.This will affect phased-array radar number
Beam shape after word Wave beam forming (DBF), directly influences the angle measurement accuracy to target；Meanwhile, interchannel is inconsistent will lift
High minor level, thus reduce the signal detection ability of radar.Therefore in the application of phased-array radar, it is necessary to carry out passage school
Just.In actual application, the main discordance considering amplitude and discordance two parts of phase place.
In engineering practice, mainly there are standard analog signal method and far-field signal method two kinds.Standard analog signal method is by signal
The signal that source produces is simultaneously sent to N number of passage through isometric feeder line, it is ensured that the entry signal of N number of passage is completely the same, then passes through
Discordance between digital method sense channel.The advantage of standard analog signal method is to be corrected in real time, and shortcoming exists
In needing the increase feeder unit for correction, increase equipment amount, be unfavorable for reducing volume, reducing cost.Far-field signal method
It is in array normal direction, sets up coherent signal source in the distance meeting far field condition, as with reference to carrying out channel correcting.
Far-field signal method is generally not capable of carrying out in real time.Owing to difference between channels is slow change, institute generally can meet application in this way
Requirement.The ultimate principle of far-field signal method is very simple, but in actual application, be easily subject to signal source loudspeaker pattern shapes,
Receive the cell orientation diagram shape of passage antenna, and the impact of other environment uncertain factor, especially when the wave beam of array
When coverage is bigger, directly carries out normal direction signal correction and can not obtain satisfied calibration result.
Summary of the invention
Solve the technical problem that
In place of the deficiencies in the prior art, the present invention proposes a kind of correction side receiving channel array for radar
Method.
Technical scheme
A kind of bearing calibration receiving channel array for radar, it is characterised in that step is as follows:
Step 1: uniform rotation radar receives the front of channel array, the angle, θ that record rotatesm, m=1,2 ..., M and thunder
Reach reception passage Rn, n=1,2 ..., the amplitude A that N is correspondingn(θm) and phase place
Step 2: calculate passage RnAmplitude equalizing valueWith amplitude correction value it isA is expectation
Amplitude；
Step 3: select R1Passage is as phase reference passage, by passage RnPhase placeDeduct stripped deviation, calculate
Formula is as follows:
Wherein d is the spacing of adjacent array element；
Step 4: calculate passage RnPhase place averageWhenTime, reject
DataThe composition set of remaining phase placeWherein θmaxFor error threshold；
Step 5: set of computationsThe meansigma methods of middle dataAnd basisDetermine that phase correcting value is
Step 6: be according to amplitude correction valueWith phase correcting value it isCalculate passage RnCorrection after letter
Number:
Wherein e represents natural logrithm, and j is imaginary unit, SnFor passage RnReception signal.
Described angle, θmIt it is equal interval sampling.
Described error threshold θmaxSpan be 0.3～0.4 radian.
Beneficial effect
A kind of bearing calibration receiving channel array for radar that the present invention proposes, has enrolled receiving array unit one
Determine width phase data in angular range, it is possible to overcome array element gain discordance in different directions to be brought well
Impact, corrects relative to fixed position, it is possible to obtain more stable reliable calibration result, this advantage in receiving wave cover
Receiving array for broad beam is especially apparent.The method is applied in engineering practice.
Accompanying drawing explanation
Fig. 1 phased-array radar one-dimensional receiving array schematic diagram
The flow chart that Fig. 2 present invention realizes
Detailed description of the invention
In conjunction with embodiment, accompanying drawing, the invention will be further described:
First set up signal source, and the distance receiving channel array should meet far field condition.Corresponding signal frequency is set
Rate, it is unsaturated that the signal amplitude of output should ensure that radar receives passage, simultaneously greater than receives passage A/D converter (A/D) amount
Change noise at least more than 20dB.
Reception channel array is fixed on turntable, typically only allows for turntable and rotate in the horizontal direction, to be corrected
Array should be consistent with horizontal plane direction.As a example by the one-dimensional array shown in Fig. 1.If the coverage that radar is in orientation is-30 °
～+30 °, then the slewing area of turntable takes-20 °～about+20 ° and gets final product (0 ° is direction, signal source place).Phase due to motion
To relation, when turntable uniform rotation when, it is equivalent to signal incident from azimuth dimension different angles, owing to signal source amplitude is protected
Hold constant, so in turntable rotation process, in array, the entry signal power of each passage is basically unchanged.
In rotation process, angle is carried out equal interval sampling θm(m=1,2 ..., M；Unit is radian), interval is taken as
0.1 degree (approximating 0.0017 radian), records respectively reception passage R simultaneouslyn(n=1,2 ..., N) signal amplitude of outfan
An(θm) and phase place
The computational methods of amplitude correction value are as follows: seek passage RnAmplitude equalizing valueIf expectation amplitude
For A, then the amplitude correction value of this passage isIn the range of certain angle, amplitude is averaged, be advantageous in that and can overcome
The disequilibrium that the spike of antenna radiation pattern and depression are brought, so that calibration result total optimization.
When carrying out phasing, select certain passage as phase reference passage, therefore refer to passage avoid the need for into
Line phase corrects.With reference to Fig. 1, selector channel R1As phase reference passage.
During signal incident angle difference, the notional phase difference between adjacency channel is different, with reference to Fig. 1, when angle of incidence is θ,
Notional phase difference is d sin θ, so measured valueIn should comprise that fixing notional phase is poor, channel imbalance deviation, survey
Amount error three part.For passage Rn, first to deduct fixing stripped deviation, computing formula is as follows:
Wherein d is the spacing of adjacency channel.It is made up of channel imbalance deviation, measurement error two parts.In order to
Improve estimated accuracy, it is necessary to reject the bad value of measurement process.First to passage RnAll phase data (m=1,2 ..., M) ask
AverageCarry out a pre-estimation；Then abnormal data erasing is carried out: whenWithDeviation exceed certain threshold value θmax
Time (being taken as 0.35 radian), then it is assumed thatIt it is a bad value.Last again to passage RnExcess phase data be averaging, obtain
Final unbalance in phase valuePhase correcting value is
Total amplitude and phase correction formula is
Wherein e represents natural logrithm, and j is imaginary unit, SnFor passage RnReception signal,For passage RnCorrection after
Signal.
When receiving channel array and being two-dimensional array, the correction of two dimensions can be carried out respectively, specific for certain
Passage, azimuth dimension and the corrected value of pitching dimension residing for this passage of corrected value are long-pending.
Claims (1)
1. the bearing calibration receiving channel array for radar, it is characterised in that step is as follows:
Step 1: uniform rotation radar receives the front of channel array, the angle, θ that record rotatesm, m=1,2 ..., M and radar connect
Receive passage Rn, n=1,2 ..., the amplitude A that N is correspondingn(θm) and phase place
Step 2: calculate passage RnAmplitude equalizing valueWith amplitude correction value it isA is expectation amplitude；
Step 3: select R1Passage is as phase reference passage, by passage RnPhase placeDeduct stripped deviation, computing formula
As follows:
Wherein d is the spacing of adjacent array element；
Step 4: calculate passage RnPhase place averageWhenTime, reject dataThe composition set of remaining phase placeWherein θmaxFor error threshold；
Step 5: set of computationsThe meansigma methods of middle dataAnd basisDetermine that phase correcting value is
Step 6: be according to amplitude correction valueWith phase correcting value it isCalculate passage RnCorrection after signal:
Wherein e represents natural logrithm, and j is imaginary unit, SnFor passage RnReception signal；
Described angle, θmIt it is equal interval sampling；
Described error threshold θmaxSpan be 0.3～0.4 radian.
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| CN104297736B true CN104297736B (en) | 2017-01-11 |
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| CN107329127B (en) * | 2017-07-27 | 2019-09-24 | 中国科学院国家空间科学中心 | A kind of phase linearity analysis method and system for radar system DBF Function detection |
| CN107340506B (en) * | 2017-08-15 | 2020-02-07 | 西安电子工程研究所 | Method for calibrating receiving and transmitting channels of broadband phased array radar |
| CN109752705B (en) * | 2017-11-03 | 2023-04-11 | 中电科海洋信息技术研究院有限公司 | Method, system, equipment and storage medium for measuring performance parameters of high-frequency underwater acoustic array |
| WO2019127398A1 (en) * | 2017-12-29 | 2019-07-04 | 鹤壁天海电子信息系统有限公司 | Phase alignment method and circuit |
| CN108765937B (en) * | 2018-03-30 | 2021-09-28 | 深圳市金溢科技股份有限公司 | Vehicle identification device, roadside unit and method for ETC system |
| CN109633650B (en) * | 2019-01-10 | 2023-04-25 | 南京理工大学 | Vehicle millimeter wave radar multichannel array antenna amplitude and phase correction device and method |
| CN110031809B (en) * | 2019-04-15 | 2021-07-23 | 北京电子工程总体研究所 | Radar multi-receiving-channel amplitude-phase consistency calibration method and readable storage medium |
| CN110456317B (en) * | 2019-07-30 | 2021-05-18 | 中国科学院国家空间科学中心 | Phased array radar system calibration method based on meteor trail echo |
| CN110988786B (en) * | 2019-11-20 | 2023-09-22 | 成都大公博创信息技术有限公司 | Array direction-finding calibration method |
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| CN102243300B (en) * | 2011-04-15 | 2012-10-10 | 中国人民解放军国防科学技术大学 | Method for radio frequency interference suppression and error correction of low-frequency synthetic aperture radar |
| CN102412441A (en) * | 2011-09-02 | 2012-04-11 | 中国电子科技集团公司第十研究所 | Vector averaging calibration method for phased-array antenna |
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